I wouldn't worry too much about it unless you plan to keep expensive firearms in there long term or something else valuable. Anything can be broken into. I have a friend who's gun safe was broken into. They took a freakin acetylene/oxy torch into his house and cut thru it. Idiots left the cart and one of the tanks. With prints all over them. Brilliant.
I don't have a smittybilt lockbox but I haven't been disappointed with smittybilt. I've got a smittybilt winch and smittybilt rock sliders and I think a smittybilt rear bumper (it was on it when I got it so I'm not 100% sure). I know this ain't a lock box but I've had no issues and all my stuff is as it was supposed to be and has held up.
My only complaint with smittybilt is their coatings suck. I will not pay 2x as much for a good coating and same steel just for a logo on it. (If I had the money sure! But I don't)
I know some have nothing but issues with smittybilt. Some true some not. There is better, Tuffy, for lockboxes, for example. But they are easily twice as expensive and unless you have things worth the expense I don't see it necessary. (I love the taffy center console!)
Glad your happy with it! Hope it holds up in the long run. Throw an Amazon review on there for fellow jeepers in need of a non biased review haha